4. Replace the highest-numbered memory module of those identified; then, restart the server. Repeat as
necessary.
5. Reverse the memory modules between the channels (of the same processor), and then restart the
server. If the problem is related to a memory module, replace the failing memory module.
6. (Trained technician only) Install the failing memory module into a memory module connector for
processor 2 (if installed) to verify that the problem is not the processor or the memory module connector.
7. (Trained technician only) Replace the system board.
Attempt to change to another PMEM mode fails
After the PMEM mode is changed and the system is successfully restarted, if the PMEM mode stays the
same instead of being changed, check the DRAM DIMMs and PMEM capacity to see if it meets the
requirement of the new mode (see “Memory module installation guideline” in Setup Guide).
Extra namespace appears in an interleaved region
If there are two created namespaces in one interleaved region, VMware ESXi ignores the created
namespaces and creates an extra new namespace during system booting. Delete the created namespaces
in either the Setup Utility or the operating system before the first booting with ESXi.
Migrated PMEMs are not supported
Intel Optane PMEM interleave set (DIMM X) is migrated from another system (Platform ID: 0x00), these migrated
PMEMs are not supported nor warranted in this system.
If this warning message appears, complete the following steps:
1. Move the modules back to the original system with the exact same configuration as the previous one.
2. Back up stored data in PMEM namespaces.
3. Disable PMEM security with one of the following options:
• LXPM
Go to UEFI Setup ➙ System Settings ➙ Intel Optane PMEMs ➙ Security ➙ Press to Disable
Security, and input passphrase to disable security.
• Setup Utility
Go to System Configuration and Boot Management ➙ System Settings ➙ Intel Optane PMEMs
➙ Security ➙ Press to Disable Security, and input passphrase to disable security.
4. Delete namespaces with command corresponding to the operating system that is installed:
• Linux command:
ndctl destroy-namespace all -f
• Windows Powershell command
Get-PmemDisk | Remove-PmemDisk
5. Clear Platform Configuration Data (PCD) and Namespace Label Storage Area (LSA) with the following
ipmctl command (for both Linux and Windows).
ipmctl delete -pcd
Notes: See the following links to learn how to download and use impctl in different operating systems:
• Windows: https://datacentersupport.lenovo.com/us/en/videos/YTV101407
• Linux: https://datacentersupport.lenovo.com/us/en/solutions/HT508642
6. Reboot the system, and press F1 to enter Setup Utility.
7. Power off the system.
Chapter 5. Problem determination 217
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